Researchers Submit Patent Application, “Aqueous Secondary Battery”, for Approval (USPTO 20190097231)

Energy Business Daily |

2019 APR 15 (NewsRx) -- By a News Reporter-Staff News Editor at Energy Business Daily -- From Washington, D.C., NewsRx journalists report that a patent application by the inventors KANZAKI, Yuki (Osaka-shi, Japan); SATO, Kazunobu (Osaka-shi, Japan); TAKUI, Takeji (Osaka-shi, Japan); SHIOMI, Daisuke (Osaka-shi, Japan); MITANI, Satoshi (Osaka-shi, Japan), filed on , was made available online on .

The patent’s assignee is Osaka City University (Osaka-shi, Osaka, Japan).

News editors obtained the following quote from the background information supplied by the inventors: “In recent years, as a power source for IT devices, such as mobile phones, laptop computers, and electric vehicles, electric power storage devices, such as secondary batteries and hybrid capacitors, have been widely used. As electric power storage devices, lithium-ion secondary batteries are widely used since they have excellent battery characteristics, such as electromotive force, energy density, and charge/discharge energy efficiency, and demonstrate less self-discharging. To enable these lithium-ion secondary batteries to be charged and discharged at a high voltage, for example, a non-aqueous electrolytic solution containing an organic solvent is used as an electrolytic solution. Furthermore lithium transition metal oxide is used in either of the positive electrode and the negative electrode.

“In order to improve the battery characteristics, materials used for lithium-ion secondary batteries are being studied. Patent document 1 discloses a technique of using an organic compound with a naphthalenediimide structure as the electrode active material of a lithium-ion secondary battery of a coin form. With respect to lithium-ion secondary batteries, by using an organic compound with a naphthalenediimide structure as an electrode active material, there can be obtained a secondary battery which has high energy density and output and demonstrates relatively low reduction of capacity even when charging and discharging are repeated.”

As a supplement to the background information on this patent application, NewsRx correspondents also obtained the inventors’ summary information for this patent application: “Problems to be Solved by the Invention

“However, electrolytic solutions containing an organic solvent used in lithium-ion secondary batteries are combustible and harmful to the human body. Furthermore, lithium-ion secondary batteries have a disadvantage in that they are dangerous to the user if they are damaged while being used and the electrolytic solution leaks out from the battery housing. Furthermore, lithium-ion secondary batteries using an imide compound as the electrode active material have a disadvantage in that their cycle characteristics are not satisfactory.

“Accordingly, the object of the present invention is to provide an electric power storage device using an aqueous electrolytic solution that is safe even if it is damaged while being used and the electrolytic solution leaks out from the battery housing. Specifically, the object of the present invention is to provide a secondary battery with both excellent safety and excellent cycle characteristics.

“Means for Solving the Problems

“The present inventors have conducted extensive studies with a view toward solving the above-mentioned problems. As a result, it has been found that, when a secondary battery comprises a compound with a naphthalenediimide structure or a perylenediimide structure as the electrode active material and has an aqueous electrolytic solution as the electrolytic solution, the secondary battery is safe, has improved stability when charged or discharged, and has excellent cycle characteristics. Specifically, the gist of the present invention for solving the above-mentioned problems is as described below.

“[1] An aqueous secondary battery, wherein at least either of a positive electrode or a negative electrode comprises compound (I) with a naphthalenediimide structure or a perylenediimide structure as an active material.

“[2] The aqueous secondary battery according to item [1], wherein compound (I) is a compound represented by the following formula (1) or (2), or a polymer with structural units represented by the following formula (3) or (4):

“##STR00001## ##STR00002## wherein, in formulae (1) to (4), each of R.sup.1 to R.sup.4, R.sup.7 to R.sup.14, R.sup.17 to R.sup.20, and R.sup.22 to R.sup.29 is independently a hydrogen atom, a halogen atom, a hydroxyl group, an alkoxy group, or a hydrocarbon group; each of R.sup.5, R.sup.6, R.sup.15, and R.sup.16 is independently a hydrogen atom, a hydroxyl group, an alkoxy group, a hydrocarbon group, or any one of groups represented by formulae (5) to (9), each of R.sup.36 to R.sup.39 is independently a hydrogen atom or a halogen atom, and M is a transition metal; R.sup.21 and R.sup.30 are a single bond, an alkylene group, a carbonyl group, an ester group, a nitrogen-containing group, an aromatic group, a heterocyclic group, a phenylene group, an oxygen-containing hydrocarbon chain, a nitrogen-containing hydrocarbon chain, or a group derived from metallocene; each of X.sup.1 to X.sup.16 is independently an oxygen atom, a sulfur atom, or an organic group, the groups indicated by R.sup.1 to R.sup.39 and X.sup.1 to X.sup.16 are individually optionally substituted with a substituent; and m and n are integers of 2 or more.

“[3] The aqueous secondary battery according to item [1] or [2], wherein the negative electrode comprises compound (I) having a naphthalenediimide structure or a perylenediimide structure as an active material.

“[4] The aqueous secondary battery according to any one of items [1] to [3], wherein the positive electrode comprises compound (I) having a naphthalenediimide structure or a perylenediimide structure as an active material.

“[5] The aqueous secondary battery according to item [3], wherein the positive electrode comprises at least one compound selected from the group consisting of compounds represented by the following formulae (10) to (16) as an active material:

“##STR00003## wherein each of R.sup.40 to R.sup.61 is independently a hydrogen atom, a halogen atom, an aromatic group, a heterocyclic group, a carboxyl group, an amino group, a nitro group, a formyl group, a cyano group, a hydroxyl group, an alkoxy group, a thiol group, an alkylthio group, or a hydrocarbon group; M is a transition metal; and the groups indicated by R.sup.40 to R.sup.61 are individually optionally substituted with a substituent.

“[6] The aqueous secondary battery according to any one of items [1] to [5], which comprises an aqueous electrolytic solution containing at least one type of salt selected from the group consisting of an alkali metal salt and an alkaline earth metal salt.

“[7] The aqueous secondary battery according to item [6] above, wherein the aqueous electrolytic solution contains a sodium salt.

“[8] The aqueous secondary battery according to any one of items [1] to [7], which comprises a conducting auxiliary, a current collector, and a binder.

“[9] A hybrid capacitor comprising compound (I) having a naphthalenediimide structure or a perylenediimide structure as an electrode active material, and having an aqueous electrolytic solution.

“Effects of the Invention

“The aqueous secondary battery of the present invention includes, in at least either of the positive electrode or the negative electrode, compound (I) having a naphthalenediimide structure or a perylenediimide structure as an active material, and uses an aqueous electrolytic solution. By virtue of this construction, the aqueous secondary battery of the present invention is safer even when the battery is damaged while being used, as compared to a conventional secondary battery using an electrolytic solution containing an organic solvent, and further, has excellent charge/discharge cycle characteristics. Therefore, the aqueous secondary battery of the present invention is dedicated in use as a stationary storage battery, and can be widely used as a power source for IT devices, such as mobile phones and laptop computers, electric vehicles and the like.”

The claims supplied by the inventors are:

“1. An aqueous secondary battery, wherein at least either of a positive electrode or a negative electrode comprises a compound (I) having a naphthalenediimide structure or a perylenediimide structure as an active material.

“2. The aqueous secondary battery according to claim 1, wherein the compound (I) is a compound represented by the following formula (1) or (2), or a polymer having structural units represented by the following formula (3) or (4): ##STR00013## ##STR00014## wherein, in formulae (1) to (4), each of R.sup.1 to R.sup.4, R.sup.7 to R.sup.14, R.sup.17 to R.sup.20, and R.sup.22 to R.sup.29 is independently a hydrogen atom, a halogen atom, a hydroxyl group, an alkoxy group, or a hydrocarbon group; each of R.sup.5, R.sup.6, R.sup.15, and R.sup.16 is independently a hydrogen atom, a hydroxyl group, an alkoxy group, a hydrocarbon group, or any one of groups represented by formulae (5) to (9), each of R.sup.36 to R.sup.39 is independently a hydrogen atom or a halogen atom, and M is a transition metal; R.sup.21 and R.sup.30 are a single bond, an alkylene group, a carbonyl group, an ester group, a nitrogen-containing group, an aromatic group, a heterocyclic group, a phenylene group, an oxygen-containing hydrocarbon chain, a nitrogen-containing hydrocarbon chain, or a group derived from a metallocene; each of X.sup.1 to X.sup.16 is independently an oxygen atom, a sulfur atom, or an organic group, the groups indicated by R.sup.1 to R.sup.39 and X.sup.1 to X.sup.16 are individually optionally substituted with a substituent; and m and n are integers of 2 or more.

“3. The aqueous secondary battery according to claim 1, wherein the negative electrode comprises a compound (I) having a naphthalenediimide structure or a perylenediimide structure as an active material.

“4. The aqueous secondary battery according to claim 1, wherein the positive electrode comprises a compound (I) having a naphthalenediimide structure or a perylenediimide structure as an active material.

“5. The aqueous secondary battery according to claim 3, wherein the positive electrode comprises at least one compound selected from the group consisting of compounds represented by the following formulae (10) to (16) as an active material: ##STR00015## wherein each of R.sup.40 to R.sup.61 is independently a hydrogen atom, a halogen atom, an aromatic group, a heterocyclic group, a carboxyl group, an amino group, a nitro group, a formyl group, a cyano group, a hydroxyl group, an alkoxy group, a thiol group, an alkylthio group, or a hydrocarbon group, M is a transition metal, and the groups indicated by R.sup.40 to R.sup.61 are individually optionally substituted with a substituent.

“6. The aqueous secondary battery according to claim 1, which comprises an aqueous electrolytic solution containing at least one type of salt selected from the group consisting of an alkali metal salt and an alkaline earth metal salt.

“7. The aqueous secondary battery according to claim 6, wherein the aqueous electrolytic solution contains a sodium salt.

“8. The aqueous secondary battery according to claim 1, which comprises a conducting auxiliary, a current collector, and a binder.”

For additional information on this patent application, see: KANZAKI, Yuki; SATO, Kazunobu; TAKUI, Takeji; SHIOMI, Daisuke; MITANI, Satoshi. Aqueous Secondary Battery. Filed and posted . Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220190097231%22.PGNR.&OS=DN/20190097231&RS=DN/20190097231

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